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Diffstat (limited to 'other/num_closed_islands.cpp')
-rw-r--r-- | other/num_closed_islands.cpp | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/other/num_closed_islands.cpp b/other/num_closed_islands.cpp deleted file mode 100644 index ba0635c..0000000 --- a/other/num_closed_islands.cpp +++ /dev/null @@ -1,61 +0,0 @@ -// 1254. Number of Closed Islands -#include "leetcode.h" - -/* - * given 2d 'grid' consists of 0's (land) and 1's (water). an island is a - * maximal four directionally connected group of 0's and a closed island is an - * island totally (all left, top, right, bottom) surrouned by 1's. return the - * number of closed islands. - */ - -class Solution { - int dx[4] = {0, 0, -1, 1}, dy[4] = {1, -1, 0, 0}; - bool is_valid(vvd & grid, int i, int j, int r, int c) { - if (i >= 0 && i < r && j >= 0 && j < c && grid[i][j] == 0) - return true; - else - return false; - } - void dfs(vvd & grid, int i, int j, int r, int c) { - grid[i][j] = 1; - for (int x = 0; x < 4; ++x) { - int new_x = i + dx[x]; - int new_y = i + dy[x]; - if (is_valid(grid, new_x, new_y, r, c)) - dfs(grid, new_x, new_y, r, c); - } - } - -public: - int closedIsland(vvd & grid) { - int r = grid.size(), c = grid[0].size(), ans = 0; - for (int i = 0; i < r; ++i) - for (int j = 0; j < c; ++j) - if (i * j == 0 || i == r - 1 || j == c - 1) - if (grid[i][j] == 0) - dfs(grid, i, j, r, c); - for (int i = 0; i < r; ++i) - for (int j = 0; j < c; ++j) - if (grid[i][j] == 0) { - ans++; - dfs(grid, i, j, r, c); - } - return ans; - } -}; - -int main() { - Solution obj; - vvd g1 = {{1, 1, 1, 1, 1, 1, 1, 0}, - {1, 0, 0, 0, 0, 1, 1, 0}, - {1, 0, 0, 0, 0, 1, 0, 1}, - {1, 1, 1, 1, 1, 1, 1, 0}}; - vvd g2 = {{0, 0, 1, 0, 0}, {0, 1, 0, 1, 0}}; - vvd - g3 = {{1, 1, 1, 1, 1, 1, 1}, {1, 0, 0, 0, 0, 0, 1}, {1, 0, 1, 1, 1, 0, 1}, - {1, 0, 1, 0, 1, 0, 1}, {1, 0, 1, 1, 1, 0, 1}, {1, 0, 0, 0, 0, 0, 1}, - {1, 1, 1, 1, 1, 1, 1}}; - printf("%d\n", obj.closedIsland(g1)); // expect: 2 - printf("%d\n", obj.closedIsland(g2)); // expect: 1 - printf("%d\n", obj.closedIsland(g3)); // expect: 2 -} |